That is the failing of the private sector, in the public sector, no office hours, you finish your classes, you are free to leave, you have no classes on one day, your whole day is free. Most get burned out on training centre work.

Yep, that is generally true of the private sector in China. But each to his own. I, for one, just like you probably have, have met too many stressed-out language mill FTs to ever consider switching from the public to the private sector. What's more, I need virtually all of my weekends and evenings to chill out totally, as well as long seasonal vacations.